W.H. Freeman and Company, 2002
Buku Teks
Rastogi, S.C.
Tata McGraw-Hill, 1995
Buku Teks
Campbell, Mary K.
Brooks/Cole Cengage Learning, 2008
Buku Teks SO
Garrett, R. (Reginald)
Saunders College, 1995
Buku Teks
Mathews, Christopher K.
Addison-Wesley, 2000
Buku Teks